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lockdep: fixup irq tracing

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Ensure we fixup the IRQ state before we hit any locking code.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2007-10-25 14:01:10 +02:00
parent c9927c2bf4
commit 143a5d325d
8 changed files with 57 additions and 12 deletions
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7
arch/x86/kernel/kprobes_32.c
View File

@ -564,12 +564,7 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs)
resume_execution(cur, regs, kcb);
regs->eflags |= kcb->kprobe_saved_eflags;
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
if (raw_irqs_disabled_flags(regs->eflags))
trace_hardirqs_off();
else
trace_hardirqs_on();
#endif
trace_hardirqs_fixup_flags(regs->eflags);
/*Restore back the original saved kprobes variables and continue. */
if (kcb->kprobe_status == KPROBE_REENTER) {

7
arch/x86/kernel/kprobes_64.c
View File

@ -551,12 +551,7 @@ int __kprobes post_kprobe_handler(struct pt_regs *regs)
resume_execution(cur, regs, kcb);
regs->eflags |= kcb->kprobe_saved_rflags;
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
if (raw_irqs_disabled_flags(regs->eflags))
trace_hardirqs_off();
else
trace_hardirqs_on();
#endif
trace_hardirqs_fixup_flags(regs->eflags);
/* Restore the original saved kprobes variables and continue. */
if (kcb->kprobe_status == KPROBE_REENTER) {

2
arch/x86/kernel/traps_32.c
View File

@ -789,6 +789,8 @@ void restart_nmi(void)
#ifdef CONFIG_KPROBES
fastcall void __kprobes do_int3(struct pt_regs *regs, long error_code)
{
trace_hardirqs_fixup();
if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)
== NOTIFY_STOP)
return;

2
arch/x86/kernel/traps_64.c
View File

@ -807,6 +807,8 @@ asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs)
/* runs on IST stack. */
asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
{
trace_hardirqs_fixup();
if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
return;
}

5
arch/x86/mm/fault_32.c
View File

@ -303,6 +303,11 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs,
int write, si_code;
int fault;
/*
* We can fault from pretty much anywhere, with unknown IRQ state.
*/
trace_hardirqs_fixup();
/* get the address */
address = read_cr2();

5
arch/x86/mm/fault_64.c
View File

@ -304,6 +304,11 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
unsigned long flags;
siginfo_t info;
/*
* We can fault from pretty much anywhere, with unknown IRQ state.
*/
trace_hardirqs_fixup();
tsk = current;
mm = tsk->mm;
prefetchw(&mm->mmap_sem);

21
include/asm-x86/irqflags_32.h
View File

@ -129,6 +129,27 @@ static inline int raw_irqs_disabled(void)
return raw_irqs_disabled_flags(flags);
}
/*
* makes the traced hardirq state match with the machine state
*
* should be a rarely used function, only in places where its
* otherwise impossible to know the irq state, like in traps.
*/
static inline void trace_hardirqs_fixup_flags(unsigned long flags)
{
if (raw_irqs_disabled_flags(flags))
trace_hardirqs_off();
else
trace_hardirqs_on();
}
static inline void trace_hardirqs_fixup(void)
{
unsigned long flags = __raw_local_save_flags();
trace_hardirqs_fixup_flags(flags);
}
#endif /* __ASSEMBLY__ */
/*

20
include/asm-x86/irqflags_64.h
View File

@ -111,6 +111,26 @@ static inline int raw_irqs_disabled(void)
return raw_irqs_disabled_flags(flags);
}
/*
* makes the traced hardirq state match with the machine state
*
* should be a rarely used function, only in places where its
* otherwise impossible to know the irq state, like in traps.
*/
static inline void trace_hardirqs_fixup_flags(unsigned long flags)
{
if (raw_irqs_disabled_flags(flags))
trace_hardirqs_off();
else
trace_hardirqs_on();
}
static inline void trace_hardirqs_fixup(void)
{
unsigned long flags = __raw_local_save_flags();
trace_hardirqs_fixup_flags(flags);
}
/*
* Used in the idle loop; sti takes one instruction cycle
* to complete: